I read some of the same on the support pages of wpengine. I’ve already tried to delete all modules and themes, except for WooCommerce, WooCommerce Quickpay and Twenty Fourteen. Still got the 502 though.
2.1.6 works for me as well.
I’m on wpengine.com as well and 2.1.5 works for me. Do you have WPML installed @peter?
Add first i got the error_log.txt and it had some errors, but not anything concerning this issue. I fixed those and now no error_log.txt file is being generated. No errors I guess. Hopefully Peters error log can point you in some direction.
I have the same problem. Did you figure this out yet?
